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MX98715

SINGLE CHIP FAST ETHERNET NIC CONTROLLER - CRYSTAL VERSION

Macronix International 

MX98715AEC-C

5.2.6 OPERATION MODE REGISTER ( CSR6 )

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

SCR-Scrambler Mode

PCS-PCS function

TTM-Transmit Threshold Mode

SF-Store and Forward

HBD-Hearbeat Disable

PS-Port Select

COE-Collision Offset Enable

TR-Threshold Control Bits

ST-Start/Stop Transmission Command

FC-Force collision mode

LOM-Loopback Operation Mode

FD-Full Duplex Mode

PM-Pass All Multicast

PR-Promiscuous Mode

SB-Start/Stop Backoff Counter

IF-Inverse Filtering

PB-Pass Bad Frame

HO-Hash-Only Filtering Mode

SR-Start/Stop Receive

HP-Hash/Perfect Receive Filtering Mode

Field

24

23

22

21

19

18

17

15:14

Name

SCR

PCS

TTM

SF

HBD

PS

COE

TR

Description

Scrambler Mode, default is set to enable scrambler function. Not affected by software

reset.

Default is set to enable PCS functions. CSR6<18> must be set in order to operate in

symbol mode.

Transmit Threshold Mode, set for 10 Base-T and reset for 100 Base-TX.

Store and Forward, when set, transmission starts only if a full packet is in transmit FIFO.

the threshold values defined in CSR6<15:14> are ignored

Heartbeat Disable, set to disable SQE function in 10 Base-T mode.

Port Select, deafult is 0 which is 10 Base-T mode, set for 100 Base-TX mode.

A software reset does not affect this bit.

Collision Offset Enable, set to enable a modified backoff algorithm during low collision

situation, reset for normal backoff algorithm.

Threshold Control Bits, these bits controls the selected threshold level for MX98715AEC-

C's transmit FIFO, transmission starts when frame size within the transmit FIFO is larger

than the selected threshold. Full frames with a length less than the threshold are also

transmitted.

P/N:PM0655

REV. 0.3, MAY. 04, 2000

19

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